How can I move messages from my inbox to my computer, completely out of outlook.  

My office only offers 100mb of email storage and I'm almost there...my graphic files are HUGE.  

I have tried to MOVE to "my computer inbox" but that doesn't seem to take it out of the limited storage area.

I MUST keep the copies of the incoming and outgoing messages and be able to easily access them, but I need to have them somewhere where they won't effect the limited storage capabilities.

I am one of very few in our company that uses a Mac and my email is connected to the company server (PC).

Thanks for the help.
It just became huge all of a sudden, maybe because of a shortcut I'm unaware of.  It makes using hotmail almost impossible!  How do I shrink it!  Thanks!
I have been having HUGE issues with the "Main Identity" and Database. In all this mess I seemed to have lost all my archived email messages that I have save "On my Mac".

I have been saving all my emails on Time Machine, I just do not know where they are and how I can get them back to my new "Main Identity"

Thx Much for any help you can provide.